Fixing developer build on clang >=15

[rptb1]

Fixes #163 .

[waywardmonkeys]

These warnings break the WebAssembly (#175) build as well since that also uses a newer version of clang.

[rptb1]

I can confirm that this branch is required for clang-15 and clang-16 and clang-17. Can be checked with e.g. make -C code -f lii6ll.gmk CC=clang-15 VARIETY=hot clean lii6ll/hot/mps.o

[rptb1]

This branch is required by #145 . See https://github.com/Ravenbrook/mps/pull/145/checks?check_run_id=11847545950 .

[rptb1]

@waywardmonkeys says in keybase://chat/rptb1,bmitchener/530 :

Great, 164 is most annoying as I have to keep modifying things to let it build :)

[rptb1]

Executing proc.review.check

1. Start time 11:12
2. Checked compilation with clang-15 with make -C code -f lii6ll.gmk CC=clang-15 VARIETY=hot clean testci. All passed.

[UNAA008]

I have reviewed the changed files in the context of Issue #163 and am satisfied that the changes are correct.
There would not have been time to review the whole files in an express review.
No defects found.

[rptb1]

Executing proc.review.express

1. Start time 10:47
2. We'll be applying rule.generic and rule.code
3. Im. entry.universal shouldn't demand reviews of issues.
4. Called in @UNAA008
5. Paused 10:50 while waiting for @UNAA008
6. Resume 11:07.
7. Checking started 11:12 for 10 mins.
8. Logging meeting started at 11:22.
9. Im. @UNAA008 asks that the interdiction on checking using diffs makes it clear that you're not expected to check all of the file as changed.
10. @UNAA008 found nothing. @rptb1 found 1 minor defect and 1 question.
11. proc.review.express.brainstorm: @rptb1 I could've used git blame when I was making the change to add an appropriate comment.
12. Logging ends 11:30.
13. Estimated defects remaning: 0
14. Revised change passed.
15. review.exit.calc:

• hours used: 1
• hours saved: not a lot
• major defect remaining: 0

[rptb1]

Executing proc.merge.pull-request

1. Start time 11:37
2. The compiler is the automated test for this.
3. Waiting for CI to pass until 11:50. Discussed Ghostbusters.
4. Merge took 7 minutes.